Question # 1

Bucky Balls are used as ________________

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Cutting

Grafting

Lubricants

Nil

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

Water is a ____________ covalent compound .

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Polar

Non polar

Ionic

Nil

For ________________ "like dissolves like".

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Metals

Bonds

Solubility

Nil

All metals are solid except

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AI

Mg

Na

Hg

When U-235 breaks up, it produces?

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electrons

neutrons

protons

nothing

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

In peroxides, the oxidation no. of O is

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+1

-1

+3

-3

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

The base of modern periodic table is

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Atomic number (Z)

Mass number (A)

Avogadro's Number

Quantum Number

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